Self-retaining catheter and inserting apparatus thereof

Abstract

In a self-retaining catheter in which a leading end of the catheter can be fixed to an inner wall of a tubular organ such as a blood vessel, a wire with higher stiffness than a catheter body and in a winding shape greater than an outside diameter of the catheter body is mounted inside a leading end of the catheter body or in a projecting state from the leading end of the catheter body. An aperture of a slit shape is formed in a peripheral wall of the catheter body, in order to allow a medical fluid to flow out therethrough. A self-retaining catheter inserting apparatus includes the above-stated self-retaining catheter, a core wire arranged to be inserted into and withdrawn from the self-retaining catheter, a master catheter through which the self-retaining catheter can pass, and a sheath necessary for the master catheter to be inserted into a tubular organ, and preferably, the apparatus further includes a medical fluid injection port.

What is claimed is: 
     
       1. A self-retaining catheter comprising: a tubular catheter body; and   a wire having an elastic portion which is formed resiliently into a winding shape, said wire being connected to a leading end portion of the catheter body,   wherein said self-retaining catheter is able to be self-retained by acting resilient force, which is raised by the resilient deformation of said elastic portion, on an inner wall of a tubular organ, said self-retaining catheter including;   an aperture for outflow of a medical fluid, said aperture being formed in a slit shape, said aperture opening when a pressure of the fluid inside said catheter is applied thereto, said aperture closing when the pressure of the fluid in said catheter is not applied thereto, said aperture being arranged so as not to overlap with said wire; and a contrast chip mounted near said aperture.   
     
     
       2. A self-retaining catheter according to claim 1, wherein said wire is buried in the leading end portion of said catheter body. 
     
     
       3. A self-retaining catheter according to claim 1, wherein said wire is connected to one end of said catheter body so as to project outwardly from said catheter body. 
     
     
       4. A self-retaining catheter according to claim 1, wherein said catheter body linearly extends from a position in a periphery of said winding shape to a proximal (or base) end of said catheter body. 
     
     
       5. The self-retaining catheter according to claim 1, further comprising an aperture for outflow of a medical fluid, said aperture being formed in a peripheral wall of said catheter body near the end thereof where said wire is mounted, said aperture being formed in a slit shape, said aperture opening when a pressure of the fluid inside said catheter is applied thereto, and said aperture closing when the pressure of the fluid inside said catheter is not applied thereto. 
     
     
       6. The self-retaining catheter according to claim 1, wherein said aperture is formed as being directed toward the center of the winding shape of said wire. 
     
     
       7. The self-retaining catheter according to claim 5, wherein a contrast chip is mounted near said aperture of said catheter body. 
     
     
       8. A self-retaining catheter inserting apparatus comprising the self-retaining catheter according to claim 1, a core wire arranged to be detachably inserted into the self-retaining catheter, and a master catheter having an inside diameter that permits insertion of said self-retaining catheter. 
     
     
       9. A self-retaining catheter inserting apparatus comprising the self-retaining catheter according to claim 1, a core wire arranged to be detachably inserted into the self-retaining catheter, a master catheter having an inside diameter that permits insertion of said self-retaining catheter, and a sheath for percutaneous insertion of said master catheter into a tubular organ. 
     
     
       10. A self-retaining catheter inserting apparatus comprising the self-retaining catheter according to claim 1, a core wire arranged to be detachably inserted into the self-retaining catheter, a master catheter having an inside diameter that permits insertion of said self-retaining catheter, a sheath for percutaneous insertion of said master catheter into a blood vessel, and a medical fluid injection port to be embedded in the body while being connected to a base end of the self-retaining catheter. 
     
     
       11. A self-retaining catheter according to claim 1, wherein said wire is buried in the leading end portion of said catheter body, and a given space between a leading end of said wire and the leading end of said catheter body is provided. 
     
     
       12. A self-retaining catheter according to claim 1, wherein said contrast chip has a C-shaped cross section and an opening portion of said C-shape is mounted so as to be coincided with a longitudinal direction of said slit shape while surrounding said slit shape. 
     
     
       13. A self-retaining catheter comprising: a tubular catheter body; and   a wire having an elastic portion which is formed resiliently into a winding shape, said wire being connected to a leading end portion of the catheter body,   wherein said self-retaining catheter is able to be self-retained by acting resilient force, which is raised by the resilient deformation of said elastic portion, on an inner wall of a tubular organ,   said self-retaining catheter being characterized by including an aperture for outflow of a medical fluid, said aperture being formed in a slit shape, said aperture opening when a pressure of the fluid inside said catheter is applied thereto, and said aperture closing when the pressure of the fluid in said catheter is not applied thereto,   and in that said wire is buried in the lead end portion of said catheter body, and a given space between a leading end of said wire and the leading end of said catheter body is provided.   
     
     
       14. A self-retaining catheter comprising: a tubular catheter body; and   a wire having an elastic portion which is formed resiliently into a winding shape, said wire being connected to a leading end portion of the catheter body,   wherein said self-retaining catheter is able to be self-retained by acting resilient force, which is raised by the resilient deformation of said elastic portion, on an inner wall of a tubular organ,   said self-retaining catheter being characterized by including;   an aperture for outflow of a medical fluid, said aperture being formed In a slit shape, said aperture opening when a pressure of the fluid inside said catheter is applied thereto, said aperture closing when the pressure of the fluid in said catheter is not applied thereto; and   a contrast chip being mounted near said aperture,   and in that said aperture is arranged so as not to overlap with said wire and said contrast chip has a C-shaped cross section and an opening portion of said C-shape is mounted so as to be coincided with a longitudinal direction of said slit shape while surrounding said slit shape.